CN101650406A - Local discharge on-line detection method and device of high-voltage cross-linking polythene cable system - Google Patents
Local discharge on-line detection method and device of high-voltage cross-linking polythene cable system Download PDFInfo
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- CN101650406A CN101650406A CN200910272138A CN200910272138A CN101650406A CN 101650406 A CN101650406 A CN 101650406A CN 200910272138 A CN200910272138 A CN 200910272138A CN 200910272138 A CN200910272138 A CN 200910272138A CN 101650406 A CN101650406 A CN 101650406A
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Abstract
The invention relates to local discharge on-line detection method and device of a high-voltage cross-linking polythene cable system. The device comprises a local discharge signal sensor, a local discharge signal conditioning and acquiring unit and an industry control computer. Software anti-interference is carried out on local discharge signals, various kinds of interference and noise are suppressed, weak local discharge signals are extracted from strong interference and are displayed in a discharge capacity form, a three-dimensional spectrum containing discharge times, the discharge capacityand a discharge phase is formed, and data which are continuously monitored by an enclosure are written into a database for the convenience of history inquiry, so that the trend change of the dischargecapacity of each enclosure is grasped and technical data for determining the insulated state of the cable system is provided. The invention has the advantages that: according to the on-site requirements, the method and the device can carry out wide band high-speed local discharge detection on an electrified cable system through the software-hardware combined anti-interference scheme, effectivelymonitor the insulated conditions of cable equipment, prevent catastrophic failures and provide scientific basis for state maintenance of a cable system.
Description
Technical field
The present invention relates to a kind of high-voltage cross-linking polythene cable system local discharge on-line detection method and device, belong to cable machinery detection technique field.
Background technology
Development along with high pressure and ultrahigh voltage power cable, crosslinked polyethylene (XLPE) power cable lays simple, few, the safe and reliable characteristics of operation maintenance work with its rational technology and structure, good electric property, installation, has obtained application more and more widely in electric system.The high-voltage and ultra-high cable system has occupied important status as the important step of urban electricity supply and main grid structure in China's urban distribution network.How realizing the state-detection of these cable machineries, guarantee the cable machinery safe and reliable operation, is the focus of studying both at home and abroad at present.Shelf depreciation is the sign and the main cause of high-voltage cross-linking polythene (XLPE) cable machinery insulation degradation.Potential faults can be in time found in the online detection of cable system shelf depreciation, insulation degradation is carried out forecast in early stage and assessment, actively effectively prevent cable system burst operation troubles, being the most directly perceived, the most desirable, the most effectual way of the operating cross-linking polythene cable system insulation of present judgement, evaluation quality, is to realize the vital technological means of cable machinery repair based on condition of component.
Cable accessory for example intermediate head all is artificial fabrication and installation under the condition at the scene, and its insulation quality often is lower than cable body insulation quality, be the weak link that insulate in the cable system.The various constructional deficiencies of the bad formation of intermediate head construction technology make joint internal electric field skewness, cause the generation of shelf depreciation.Under power-frequency voltage, shelf depreciation will cause generation and the expansion of electricity tree in the cable insulation, and quicken the deterioration of insulation, finally cause insulation breakdown.
The XLPE cable online detector for partial discharge of development is a lot of both at home and abroad at present, but the in-site measurement effect reaches desirable level far away, main cause is: because local discharge signal is faint, amplitude is very little, very easily disturbed and ground unrest floods by extraneous strong-electromagnetic field, and the anti-interference scheme effect that device adopted of development is unsatisfactory both at home and abroad at present, easily the external interference erroneous judgement is local discharge signal, and the narrow band filter that most of device adopted can cause the local discharge signal wave form distortion, and these all greatly reduce the sensitivity of online detection, accuracy, confidence level.Therefore, how to use existing advanced technology, suppress to disturb to greatest extent, accurate extraction office discharge signal, more reliable, more delicately for follow-up insulation diagnosis provides information, become the important research content in the online detection of cable machinery shelf depreciation.
Summary of the invention
The problems referred to above that online detection exists at present cable machinery the object of the present invention is to provide a kind of high-voltage cross-linking polythene cable system local discharge on-line detection method and device, can the interior local discharge signal of online detection streamer annex certain limit.
Technical scheme of the present invention is, the high-voltage cross-linking polythene cable system local discharge on-line detection method, it is characterized in that: the high-frequency wideband sensor sleeve is connected on the local discharge signal that is coupled on cable accessory ground wire or the cross interconnected line, the 50Hz voltage sensor is socketed in the power-frequency voltage signal that is coupled on the cable body, slave computer is nursed one's health and high speed acquisition sensor signal, and image data is sent to host computer by the usb communication interface, utilize host computer to carry out anti-interference process and result's demonstration, realize the online detection of cable machinery shelf depreciation; May further comprise the steps:
(1) socket high-frequency wideband sensor on threephase cable annex ground wire or cross interconnected line is used for the local discharge signal that is coupled, and by inserting on the passage of high-speed data acquisition card behind the signal condition, carries out the sampling of three-phase synchronous high-speed;
(2) socket 50Hz power-frequency voltage sensor on cable body by sampling on the passage that also inserts high-speed data acquisition card behind the signal condition, is used for the triggering of local discharge signal acquisition channel, to determine the power-frequency voltage phase place of local discharge signal;
(3) include the preposition conditioning module of signal, high-speed data acquisition card, I/O (I/O) control card in the slave computer, be used for finishing preliminary interference inhibition, triggering collection, the data storage of local discharge signal;
(4) upper computer software is finished the control to slave computer, and the reception of image data, Software Anti-interference show apparent discharge capacity, N-Q-φ (discharge time-discharge capacity-discharge phase) spectrogram that discharges, and finishes database storing, the report generation of measurement result;
(5), form the discharge trend database, thereby grasp annex insulation operation conditions by continuous monitoring to each annex discharge capacity.
Aforesaid high-voltage cross-linking polythene cable system local discharge on-line detection method is characterized in that: the high sampling rate of high-speed data acquisition card is 100MS/s, and analog bandwidth is 60MHz, and A/D resolution is 12.
Aforesaid high-voltage cross-linking polythene cable system local discharge on-line detection method is characterized in that: the high-frequency wideband sensor adopts nickel-zinc ferrite, and frequency range is 40kHz-25MHz.
The high-voltage cross-linking polythene cable system online detector for partial discharge, comprise the high-frequency wideband sensor, 50Hz power-frequency voltage sensor, it is characterized in that: also comprise slave computer, host computer, slave computer includes the preposition conditioning module of signal, high-speed data acquisition card, the I/O control card, its annexation is: the high-frequency wideband sensor sleeve is connected on threephase cable annex ground wire or the cross interconnected line, 50Hz power-frequency voltage sensor sleeve is connected on the cable body, the high-frequency wideband sensor is connected the preposition conditioning module of signal respectively with 50Hz power-frequency voltage sensor, the preposition conditioning module of signal connects high-speed data acquisition card, high-speed data acquisition card connects host computer by the usb communication interface that is fixed on the slave computer, host computer connects the I/O control card, and the I/O control card connects preposition conditioning module of signal and high-speed data acquisition card respectively.
The invention has the advantages that and can sample by synchronous high-speed according to on-the-spot needs to HV CABLE SYSTEM three-phase annex, and software and hardware combined anti-interference scheme, realize the online detection of shelf depreciation.The mode of this device wideband high speed acquisition can be obtained complete local discharge signal waveform, can show apparent discharge capacity and various discharge spectrogram in real time, possesses database storing, the historical query of discharge capacity, functions such as measurement result report generation.The continuous monitoring of discharge capacity can realize the monitoring to the cable system insulation status, for the state maintenance of cable machinery provides strong technical support.
Description of drawings
Fig. 1 is a general flow chart of the present invention.
Fig. 2 is apparatus of the present invention structural representation.
Fig. 3 is apparatus of the present invention functional schematic.
Fig. 4 is the N-Q-φ spectrogram of embodiment of the invention shelf depreciation.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
The present invention is made of signal transducer, local discharge signal conditioning collecting unit and host computer.The high-frequency wideband sensor is installed on the local discharge signal that is coupled on cable accessory ground wire or the cross interconnected line, and 50Hz power-frequency voltage sensor is installed on the power-frequency voltage signal that is coupled near the body of annex; Local discharge signal conditioning collecting unit is finished the pre-service of clutter on the ground wire, suppressing part disturbs, signal condition is carried out high-speed data acquisition to the data collecting card input range, and with acquired data storage in jumbo ROM, and image data is sent to host computer by the usb communication interface; Host computer links to each other with slave computer by USB interface, is used to control slave computer, receives image data, by further anti-interference process, serves as real-time demonstration with reference to discharge spectrograms such as the apparent discharge capacity that forms shelf depreciation, N-Q-φ with the power-frequency voltage phase place.The measurement result of each detected object can be carried out the database storing report generation, makes things convenient for historical query and discharge trend analysis.
(1) signal transducer
The high-frequency wideband signal transducer adopts nickel-zinc ferrite, and frequency range is 40kHz-25MHz, is socketed in during measurement that to form sensor on three-phase annex ground wire or the cross interconnected line right, and the signal of coupling comprises local discharge signal, interference, ground unrest.
50Hz power frequency component sensor is used for the power-frequency voltage signal of coupling cable body, as triggering collection, and the operating frequency phase at definite discharge signal place.
(2) slave computer signal condition collecting unit
Advance signal conditioning unit is installed near the sensor, the signal of sensor output is carried out the hardware filtering partly disturb, and makes follow-up amplifying unit amplify local discharge signal, to improve detection sensitivity.
The program control signal amplifying unit has 0.5,1,5,10,20,50,100 times enlargement factor, with the input range of signal condition to data collecting card the best.
The high sampling rate of the data collecting card that is adopted is 100MS/s, and analog bandwidth is 60MHz, and A/D resolution is 12, and the signal storage of high speed acquisition is in ROM.
The transmission that the I/O control card is used for controlling control command between upper and lower computer receives.
(3) upper computer software
Upper computer software is used for controlling the slave computer data acquisition, program control signal conditioning unit is set and controls the image data that reception slave computer ROM stores.After each phase synchronization signal carried out comprehensive anti-interference process, upper computer software extracted local discharge signal, showed shelf depreciation apparent discharge capacity, and discharge spectrogram such as N-Q-φ.
The result who measures can be recorded into database, generate form, realizes historical query by data base administration, realizes the trend analysis of each annex discharge capacity, and insulation degradation is carried out forecast in early stage and assessment, actively effectively prevents cable system burst operation troubles.
Embodiment: the shelf depreciation apparent discharge capacity that shows during certain local discharge signal is measured, and discharge spectrogram, as shown in Figure 4.
(1) measure of skewness: Sk+=0.900, Sk-=-0.043;
(2) steepness: Ku+=-0.869, Ku-=-1.956;
(3) peak value: Pe+=61, Pe-=78;
(4) degree of asymmetry: Asy=1.516;
(5) revise cross-correlation coefficient: mcc=0.857;
(6) phase coefficient: ph=2.3.
Claims (4)
1. high-voltage cross-linking polythene cable system local discharge on-line detection method, it is characterized in that: the high-frequency wideband sensor sleeve is connected on the local discharge signal that is coupled on cable accessory ground wire or the cross interconnected line, the 50Hz voltage sensor is socketed in the power-frequency voltage signal that is coupled on the cable body, slave computer is nursed one's health and high speed acquisition sensor signal, and image data is sent to host computer by the usb communication interface, utilize host computer to carry out anti-interference process and result's demonstration, realize the online detection of cable machinery shelf depreciation; May further comprise the steps:
(1) socket high-frequency wideband sensor on threephase cable annex ground wire or cross interconnected line is used for the local discharge signal that is coupled, and by inserting on the passage of high-speed data acquisition card behind the signal condition, carries out the sampling of three-phase synchronous high-speed;
(2) socket 50Hz power-frequency voltage sensor on cable body by sampling on the passage that also inserts high-speed data acquisition card behind the signal condition, is used for the triggering of local discharge signal acquisition channel, to determine the power-frequency voltage phase place of local discharge signal;
(3) include the preposition conditioning module of signal, high-speed data acquisition card, I/O control card in the slave computer, be used for finishing preliminary interference inhibition, triggering collection, the data storage of local discharge signal;
(4) upper computer software is finished the control to slave computer, and the reception of image data, Software Anti-interference show apparent discharge capacity, the N-Q-φ spectrogram that discharges, and finishes database storing, the report generation of measurement result;
(5), form the discharge trend database, thereby grasp annex insulation operation conditions by continuous monitoring to each annex discharge capacity.
2. high-voltage cross-linking polythene cable system local discharge on-line detection method as claimed in claim 1 is characterized in that: the high sampling rate of high-speed data acquisition card is 100MS/s, and analog bandwidth is 60MHz, and A/D resolution is 12.
3. high-voltage cross-linking polythene cable system local discharge on-line detection method as claimed in claim 1 is characterized in that: the high-frequency wideband sensor adopts nickel-zinc ferrite, and frequency range is 40kHz-25MHz.
4. high-voltage cross-linking polythene cable system online detector for partial discharge, comprise the high-frequency wideband sensor, 50Hz power-frequency voltage sensor, it is characterized in that: also comprise slave computer, host computer, slave computer includes the preposition conditioning module of signal, high-speed data acquisition card, the I/O control card, its annexation is: the high-frequency wideband sensor sleeve is connected on threephase cable annex ground wire or the cross interconnected line, 50Hz power-frequency voltage sensor sleeve is connected on the cable body, the high-frequency wideband sensor is connected the preposition conditioning module of signal respectively with 50Hz power-frequency voltage sensor, the preposition conditioning module of signal connects high-speed data acquisition card, high-speed data acquisition card connects host computer by the usb communication interface that is fixed on the slave computer, host computer connects the I/O control card, and the I/O control card connects preposition conditioning module of signal and high-speed data acquisition card respectively.
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| CN101819246A (en) * | 2010-04-27 | 2010-09-01 | 重庆大学 | Discharge capacity monitoring and collecting method, device and system for ultrahigh frequency local discharge |
| CN102116824A (en) * | 2010-11-30 | 2011-07-06 | 国网电力科学研究院 | Distributed local discharge on-line monitoring method and device for high voltage cable system |
| CN102243289A (en) * | 2011-06-20 | 2011-11-16 | 国网电力科学研究院 | Method and apparatus for partial discharge detection of high-voltage electrical power equipment with hardware anti-interference utilization |
| CN102692585A (en) * | 2011-03-18 | 2012-09-26 | Ls产电株式会社 | Apparatus for detecting partial discharge signal and method thereof |
| CN103091610A (en) * | 2013-01-11 | 2013-05-08 | 辽宁省电力有限公司朝阳供电公司 | Method for transformer fault graphic early warning |
| CN103197218A (en) * | 2013-04-23 | 2013-07-10 | 国家电网公司 | High-voltage cable insulation defect partial discharge electrification detection diagnostic method |
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| CN103901330A (en) * | 2014-04-15 | 2014-07-02 | 上海君世电气科技有限公司 | Partial discharge on-line monitoring method for XLPE cable |
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| CN104459483A (en) * | 2014-11-10 | 2015-03-25 | 国网甘肃省电力公司刘家峡水电厂 | 330 kV power cable line partial discharge monitoring method and device |
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| CN102116824A (en) * | 2010-11-30 | 2011-07-06 | 国网电力科学研究院 | Distributed local discharge on-line monitoring method and device for high voltage cable system |
| CN102692585A (en) * | 2011-03-18 | 2012-09-26 | Ls产电株式会社 | Apparatus for detecting partial discharge signal and method thereof |
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| CN102243289B (en) * | 2011-06-20 | 2014-08-20 | 国网电力科学研究院 | Method and apparatus for partial discharge detection of high-voltage electrical power equipment with hardware anti-interference utilization |
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| CN105842595B (en) * | 2016-05-20 | 2018-09-11 | 国网河北省电力有限公司石家庄供电分公司 | A kind of broadband scan-type cable local discharge measuring device |
| CN106771857A (en) * | 2016-12-05 | 2017-05-31 | 广西电网有限责任公司柳州供电局 | Cross-inked polyethylene power cable insulation defect characteristic gas detecting system |
| CN106771857B (en) * | 2016-12-05 | 2023-05-12 | 广西电网有限责任公司柳州供电局 | Insulation defect characteristic gas detection system for crosslinked polyethylene power cable |
| CN112557840A (en) * | 2020-11-24 | 2021-03-26 | 西南交通大学 | XLPE cable insulation state evaluation method based on discharge energy difference |
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Open date: 20100217 |